Regioselective Synthesis of 1,2-Dihydropyridines by Rhodium-Catalyzed Hydroboration of Pyridines
作者:Kazuyuki Oshima、Toshimichi Ohmura、Michinori Suginome
DOI:10.1021/ja3002953
日期:2012.2.29
Pyridine undergoes addition of pinacolborane at 50 °C in the presence of a rhodium catalyst, giving N-boryl-1,2-dihydropyridine in a high yield. The selective 1,2-hydroboration also takes place in the reactions of substituted pyridines. In the reaction of 3-substituted pyridines, 3-substituted N-boryl-1,2-dihydropyridines are formed regioselectively.
在铑催化剂的存在下,吡啶在 50 °C 下加入频哪醇硼烷,以高产率得到 N-boryl-1,2-dihydropyridine。选择性的 1,2-硼氢化反应也发生在取代吡啶的反应中。在3-取代吡啶的反应中,3-取代的N-boryl-1,2-二氢吡啶区域选择性地形成。